From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f180.google.com (mail-pl1-f180.google.com [209.85.214.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2B44E3C34 for ; Tue, 14 Mar 2023 13:20:28 +0000 (UTC) Received: by mail-pl1-f180.google.com with SMTP id x11so16534156pln.12 for ; Tue, 14 Mar 2023 06:20:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1678800027; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=BGeO30lDzCVJA69wB0isBNBFflJKSvmbp2xv2YwkISg=; b=N8yB/hmvUwDNq4U380ZLQ/mBfJ3N6JqFs3E/DfzHd0EcSB/ROMEZ2X7Mbu/wDPqOSt X8hTWoryi7yHzP8voZRYRbbDJsmNC+QM5Ti/3R04qvFB+Wjq5EhxdtHasmw3z5REC+fX z+27vRr9MvJHV8ilBrWb9Fut8/r29WNrfZiRm0pX1fgRXEIfkUIpf3P0cH5ZnOrZrBLs 2xPLfg/0K76pjejtBJovbOoVqa6XCgL8nnC4LWPxp3n93CDj7JqGOKDouu26VHIg9mxy NpT7hPDC4lxHQM4EzkypVTQsGklqNHuc3QMjmcLVeiirqBXE312jbNOBJN1GhDmwurCI Dxlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678800027; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=BGeO30lDzCVJA69wB0isBNBFflJKSvmbp2xv2YwkISg=; b=TCtvDClCPLYTkmOxfsxDTkvRKXfK0wotB2V4Emu+8D/0OtJQdLYdWncVXIjWQ9sBUO gPUReM9418VLY4si4k1rEDuwFUZFBRxVl2hj1/nEkztV8vuJlwRGg45CUv91ZqdwdMMx OwXcE8AAX5BN1NLLYxMNPyv4swZl6x9xFiq7BPTY89ZtI00TQCqTD7U97JQo3V6zQUlJ 4q4FvhkAxzG1+xxnZYSyWURdY0h/AQo5YITmdVhICjCf9chTrtlgttuemr1s9Z2e4kd5 o45gjisXCdA6kMx8Ed1ghw6adtNlDiRHXCcs0bNZ9ToRLPFZaZMvjr8aZQXWuYwg3pqV 9Fkg== X-Gm-Message-State: AO0yUKUohNXGCSYIcgCQo0b6mQOUxgHzy8u2Cdj1PjO9Zc4q5mSFxCJo IIaL1qCrsUk7PAK7FFdxHJeI X-Google-Smtp-Source: AK7set92BKgWo9k7vOJJuH6sMlRcRQA156L8+Pr2OYvSE4DfETPPXr/PPN/jNfis14C4iqN8TK+aXg== X-Received: by 2002:a17:903:2341:b0:1a0:6d96:d62f with SMTP id c1-20020a170903234100b001a06d96d62fmr1502663plh.2.1678800027391; Tue, 14 Mar 2023 06:20:27 -0700 (PDT) Received: from thinkpad ([117.217.182.35]) by smtp.gmail.com with ESMTPSA id k5-20020a170902e90500b0019251e959b1sm1716382pld.262.2023.03.14.06.20.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Mar 2023 06:20:26 -0700 (PDT) Date: Tue, 14 Mar 2023 18:50:18 +0530 From: Manivannan Sadhasivam To: Robin Murphy Cc: Johan Hovold , will@kernel.org, joro@8bytes.org, andersson@kernel.org, johan+linaro@kernel.org, steev@kali.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] iommu/arm-smmu-qcom: Rework the logic finding the bypass quirk Message-ID: <20230314132018.GC137001@thinkpad> References: <20230314105905.137241-1-manivannan.sadhasivam@linaro.org> <20230314112620.GB137001@thinkpad> <13b46d42-e497-8dd7-4785-f58447128a40@arm.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <13b46d42-e497-8dd7-4785-f58447128a40@arm.com> On Tue, Mar 14, 2023 at 11:58:24AM +0000, Robin Murphy wrote: > On 2023-03-14 11:26, Manivannan Sadhasivam wrote: > > On Tue, Mar 14, 2023 at 12:17:38PM +0100, Johan Hovold wrote: > > > On Tue, Mar 14, 2023 at 04:29:05PM +0530, Manivannan Sadhasivam wrote: > > > > The logic used to find the quirky firmware that intercepts the writes to > > > > S2CR register to replace bypass type streams with a fault, and ignore the > > > > fault type, is not working with the firmware on newer SoCs like SC8280XP. > > > > > > > > The current logic uses the last stream mapping group (num_mapping_groups > > > > - 1) as an index for finding quirky firmware. But on SC8280XP, NUSMRG > > > > reports a value of 162 (possibly emulated by the hypervisor) and logic is > > > > not working for stream mapping groups > 128. (Note that the ARM SMMU > > > > architecture specification defines NUMSMRG in the range of 0-127). > > > > > > > > So the current logic that checks the (162-1)th S2CR entry fails to detect > > > > the quirky firmware on these devices and SMMU triggers invalid context > > > > fault for bypass streams. > > > > > > > > To fix this issue, rework the logic to find the first non-valid (free) > > > > stream mapping register group (SMR) within 128 groups and use that index > > > > to access S2CR for detecting the bypass quirk. If no free groups are > > > > available, then just skip the quirk detection. > > > > > > > > While at it, let's move the quirk detection logic to a separate function > > > > and change the local variable name from last_s2cr to free_s2cr. > > > > > > > > Reviewed-by: Bjorn Andersson > > > > Signed-off-by: Manivannan Sadhasivam > > > > --- > > > > > > > > Changes in v2: > > > > > > > > * Limited the check to 128 groups as per ARM SMMU spec's NUMSMRG range > > > > * Moved the quirk handling to its own function > > > > * Collected review tag from Bjorn > > > > > > > > drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 48 ++++++++++++++++++---- > > > > 1 file changed, 40 insertions(+), 8 deletions(-) > > > > > > > > diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c > > > > index d1b296b95c86..48362d7ef451 100644 > > > > --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c > > > > +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c > > > > @@ -266,25 +266,49 @@ static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain, > > > > return 0; > > > > } > > > > -static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu) > > > > +static void qcom_smmu_bypass_quirk(struct arm_smmu_device *smmu) > > > > { > > > > - unsigned int last_s2cr = ARM_SMMU_GR0_S2CR(smmu->num_mapping_groups - 1); > > > > struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); > > > > - u32 reg; > > > > - u32 smr; > > > > + u32 free_s2cr; > > > > + u32 reg, smr; > > > > int i; > > > > + /* > > > > + * Find the first non-valid (free) stream mapping register group and > > > > + * use that index to access S2CR for detecting the bypass quirk. > > > > + * > > > > + * Note that only the first 128 stream mapping groups are considered for > > > > + * the check. This is because the ARM SMMU architecture specification > > > > + * defines NUMSMRG (Number of Stream Mapping Register Groups) in the > > > > + * range of 0-127, but some Qcom platforms emulate more stream mapping > > > > + * groups with the help of hypervisor. And those groups don't exhibit > > > > + * the quirky behavior. > > > > + */ > > > > + for (i = 0; i < 128; i++) { > > > > > > This may now access registers beyond smmu->num_mapping_groups. Should > > > you not use the minimum of these two values here (and below)? > > > > > > > Doh! yeah, you're right. Will fix it in v3. > > FWIW I'd say it's probably best if the cfg_probe hook clamps > smmu->num_mapping_groups to the architectural maximum straight away, to also > prevent the main driver iterating off into the nonsensical area in > arm_smmu_device_reset() or the SMR allocator itself. > We considered that also but Qcom purposefully extended the NUMSMRG for virtualization usecase and we do not have a clear picture of it. That's the reason we settled with capping the value only for the quirk detection. Thanks, Mani > (Note that we don't support the weird EXSMRGS extension that appeared in a > late version of the architecture, but even if we did, that still reports 128 > for IDR0.NUMSMRG, and the extra extended SMRs live somewhere completely > different.) > > Thanks, > Robin. -- மணிவண்ணன் சதாசிவம் From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 51BDAC6FD1D for ; Tue, 14 Mar 2023 13:21:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: 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by smtp.gmail.com with ESMTPSA id k5-20020a170902e90500b0019251e959b1sm1716382pld.262.2023.03.14.06.20.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Mar 2023 06:20:26 -0700 (PDT) Date: Tue, 14 Mar 2023 18:50:18 +0530 From: Manivannan Sadhasivam To: Robin Murphy Cc: Johan Hovold , will@kernel.org, joro@8bytes.org, andersson@kernel.org, johan+linaro@kernel.org, steev@kali.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] iommu/arm-smmu-qcom: Rework the logic finding the bypass quirk Message-ID: <20230314132018.GC137001@thinkpad> References: <20230314105905.137241-1-manivannan.sadhasivam@linaro.org> <20230314112620.GB137001@thinkpad> <13b46d42-e497-8dd7-4785-f58447128a40@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <13b46d42-e497-8dd7-4785-f58447128a40@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: 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